Troubleshooting guide

CHAPTER

5-1

ATM and Layer 3 Switch Router Troubleshooting Guide

OL-1969-02

Troubleshooting Switch Router ATM

Interface Connections

This chapter provides troubleshooting information about connectivity and performance problems in the

physical interfaces of a switch router.

The chapter includes the following sections:

• Performing Basic Interface Checks, page 5-1

• Determining Network Connectivity, page 5-5

• Performing OAM Loopback Tests, page 5-6

• Common show controller Troubleshooting Fields, page 5-12

• Using the debug Commands to Troubleshoot an Interface, page 5-19

• Troubleshooting 155-Mbps and 622-Mbps Interfaces, page 5-20

• Troubleshooting OC-3c, OC-12c, and OC-48c Interfaces, page 5-26

• Troubleshooting T1 and E1 Interfaces, page 5-32

• Troubleshooting DS3 and E3 Interfaces, page 5-38

• Troubleshooting CES T1 and CES E1 Interfaces, page 5-46

• Troubleshooting 25-Mbps Interfaces, page 5-50

• Troubleshooting Channelized DS3 and E1 Frame Relay Interfaces, page 5-53

Note For detailed cabling and hardware information for each port adapter, refer to the ATM Port Adapter

and Interface Module Installation Guide. The default configurations for the various port adapters are

described in the “Configuring Interfaces” chapter in the ATM Switch Router Software Configuration

Guide.

Performing Basic Interface Checks

This section outlines the steps for performing basic interface checks and verifies that an

ATM switch router interface is enabled and functioning correctly.

Always check the following when an interface fails:

• The port free of dust and debris?

• Are the cables inserted properly?